For Atom feeds, it validates against draft-ietf-atompub-format-11, which describes version 1.0 of the Atom feed format. This draft will become an RFC when a number is assigned by the IETF.

+

For Atom feeds, it validates against RFC 4287, which describes version 1.0 of the Atom feed format.

The documentation index lists all the error messages that the validator produces. You can also download the entire test suite that was used to create the validator (see below).

@@ -73,7 +73,7 @@

Yes. The validator is open source, written in Python, and distributed under the same license as Python itself. To run it, you will need Python 2.2 or later, and an XML parser. Most Python distributions include a minimal XML parser which will work just fine. Mac OS X 10.2 users should install PyXML.